diff --git a/modules/mux/mp4.c b/modules/mux/mp4.c
index 511bd1c9edc6efd1ddb7f5418a6349cfc16bfa1f..7d8e8fe709a3f2c30d97de7b5db4cdf2b50fc551 100644
--- a/modules/mux/mp4.c
+++ b/modules/mux/mp4.c
@@ -453,6 +453,7 @@ static int AddStream(sout_mux_t *p_mux, sout_input_t *p_input)
     case VLC_CODEC_MP4A:
     case VLC_CODEC_MP4V:
     case VLC_CODEC_MPGA:
+    case VLC_CODEC_MP3:
     case VLC_CODEC_MPGV:
     case VLC_CODEC_MP2V:
     case VLC_CODEC_MP1V: